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UNITED STATES PATENT OFFICE.

C. AGKERMAN, OF NEVARK, NEW' JERSEY.

LOCK.

Specification of Letters Patent No. 21,543, dated September 21, 1858.

To all whom t may concern:

Be it known that I, CHRISTIAN AGKER- MAN, of the city of Newark, in thecounty of Essex and State of New Jersey, have invented certain new anduseful Improvements in Locks, and which I have described in thefollowing specification and illustrated in the accompanying drawingswith sufficient clear ness to enable those of competent skill to makeand use the same.

The nature of my invention consists in such a construction andarrangement of parts as to give a peculiar' rolling motion to the boltand so to secure the same that it cannot be driven back without theentire destruction of the lock.

In the drawings Figure l is a view of the parts in position when thebolt is out and the closet or drawer is locked. Fig. 2 is the posit-ionof the parts when the bolt is down and the drawer unlocked. Fig. 3 showsthe peculiar construction of the bolt as it appears on one side. Fig. 4the same as it appears on the other side. Fig. 5 is an enlarged view ofthe fall to which the bolt is attached, given to show how and why thekey is prevented from turning the wrong way when attempting to lock it.

The same letters refer to the same parts in each figure.

It will be seen that the bolt a is attached to the fall b in such amanner as to partially revolve upon the pin c' the distance beinglimited by the shoulder shown in Fig. 3, the shoulder on L coming incontact each way with the edges of the fall b at m and n. The curves onthe back of o is made to effect the turning of the bolt while it isrising through the face plate of the lock, by being adapted to therising motion of b when turning on the pin o, and the bolt is preventedfrom going too far through the face plate by being made to catch againstthe underside of the face plate at the same time that b touches it, andwhen unlocked the bolt is held level with the face plate by the back vinFig. 1.

edge of I) coming in contact with the pin s. The lever c moves upon thepin 0', its upper end and the under edge of part of ZJ are adapted tothe motions of each other so that when the key Z is turned, the leverlifts the fall b and with it the bolt a, the key operates in the recessL in the lever c.

It will be seen that when locked the bolt cannot be forced back becausethe lever c is in such a position that the force operates in a line fromthe pin of the bolt to the pin of the lever as shown by the dotted lineThe lever c is assisted in its motion by the spring e.

In Fig. 5 is shown the essential mode contrived to prevent the key frombeing turned the wrong way when about to shoot out the bolt, the curve gis the line of the motion of the key, and the curve f the line of motionof the fall Z) at the notch 0,' as these curves cross each otherst-rack, when the key presses against the point k on o it brings thepoint o in contact with the end of the key and prevents it turning anyfarther.

The peculiar shape and motion of the bolt in this lock adapts the lockto all Vkinds of dressing cases closets and drawers &c. as well as topiano fortes and melodeons, which is very convenient and useful.

The lock is simple, not liable to get out of repair and admits of theintroduction into it of a variety of modes of balking the pick lockfraternity.

I am aware of various claims on rotating bolts to locks and therefore donot claim the mere rotation.

I claim- The use of the fall b and lever c in their combination with theeccentric moving bolt a when constructed and operated as herein aboveset forth.

CHRISTIAN ACKERMAN.

Witnesses W. M. GOODING, D. D. TINGLEY.

